Dr Bashir nwer
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This document describes a study that developed a land suitability model for maize and sorghum crops in northeast Libya using geographic information systems (GIS). The study aimed to create a methodology for predicting land suitability classifications under irrigation. The methodology involved defining land qualities and characteristics, collecting soil and climate data, and overlaying layers on soil, climate, erosion risk, and topography in GIS to produce suitability maps. The findings provided a validated framework for assessing land suitability in the region. The conclusion stated that GIS allows more efficient land evaluation compared to conventional methods.
Dr Bashir nwer
- 1. Land Suitability Model Using Geographic Information System (GIS) for Maize and Sorghum in North East of Libya DR BASHIR NWER GEOTUNIS 2012
- 2. UNIVERSITY Land Suitability model Using of Tripoli (GIS) for Mazie and Sorghum in North East of Libya 1. Introduction 2. Aim 3. Methodology 4. Findings 5. Conclusion 05/04/2008 BASHIR NWER GEOTUNIS 2012 2
- 3. 1- Introduction UNIVERSITY of Tripoli Location of study area The study area is located in the strip of the coastal territory and Jabal Akhdar Upland bounded by the following coordinate’s lat 30’ 33° 00’ N; long 19° 50’ ‐ 22° 45’E . 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 3
- 4. 1- Introduction UNIVERSITY of Tripoli • Land Evaluation • The need for Land Evaluation • Land evaluation is a prerequisite in achieving optimal utilisation of the available land resource for agricultural production • It guides strategic land use decision making • Land Evaluation Methodologies • Many methodologies exist • Some systems value the degree of suitability of properties, others place more emphasis on the limiting factor of soil use • Some systems Groups land into level of importance (classes, subclasses), others use mathematical formula 05/04/2008 BASHIR NWER GEOTUNIS 2012 4
- 5. UNIVERSITY 2- Aim of the paper of Tripoli The aim of this paper is : “To develop a methodology for predicting the land suitability classification for maize and Sorhgum under irrigation in North‐east Libya”. 05/04/2008 BASHIR NWER GEOTUNIS 2102 5
- 6. UNIVERSITY 3- Methodology of Tripoli (1- 9 ) Development of Land Evaluation Methodology • FAO Framework for land suitability was selected • Defining Land Utilisation Types (Maize and Sorghum ) • Defining Land Use Requirements • Defining Land Qualities, Land Characteristics and their threshold values How ? • Critically assessed the literature about land resources in Libya (Soil, Climate and Topography) • Review of text and scientific publications to determine the requirements of wheat for optimum growth • A list of LQ and LC and their threshold values proposed • Local knowledge and professional judgements are consulted • Final LQ and LC and their threshold values are developed 05/04/2008 DR BASHIR NWER GEOTUNIS 2102 6
- 7. UNIVERSITY of Tripoli 3- Methodology (2- 9 ) Code Grouping Land Qualities Land Characteristics c Climate Temperature regime Temperature s Soil Rooting conditions Rootable depth Soil Texture Moisture Availability Available water-holding capacity Nutrient Availability Soil reaction (pH) Nutrient Retention Organic Matter (O.M %) Cation Exchange Capacity (CEC) Excess of Salts Soil Salinity (EC) Soil Alkalinity (ESP) Soil Toxicities Calcium Carbonate (CaCo 3 %) Infiltration Infiltration Rate Condition for germination Gravel and Stones % Oxygen Availability Soil Drainage class e Erosion Erosion Hazard Soil Erosion (USLE) t Topography Topography Slope % DR BASHIR NWER GEOTUNIS 2012 7
- 8. UNIVERSITY 3- Methodology ( 3- 9) of Tripoli • A land suitability model was developed using weighed overlay method in the GIS to produce a land suitability classification in the study area. • Four layers ( soil, Climate, Erosion and Topography) were integrated within a GIS environment and overlain to produce the final suitability 05/04/2008 BASHIR NWER GEOTUNIS 2102 8
- 9. UNIVERSITY of Tripoli 3- Methodology ( 4- 9) Inputs Inputs Soil, Climate data Soil, Climate data Building the database Building the database And Topography And Topography Digitise the Maps, Digitise the Maps, Suitability model Suitability model ( (paper Maps) paper Maps) Climate and Soil data Climate and Soil data Arc/GIS Arc/GIS Outputs Outputs Suitability maps Suitability maps for selected crops for selected crops 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 9
- 10. UNIVERSITY of Tripoli 3- Methodology ( 5- 9) 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 10
- 11. UNIVERSITY 3- Methodology ( 6-9) of Tripoli Erosion Hazard • USLE was applied within the GIS to determine the average annual soil loss in the study area • Individual GIS files were built for each factor of the USLE and combined by cell-grid modelling procedure in the ArcInfo GIS to predict soil loss in the spatial domain Topography • Topography is expressed as slope percent and derived from the topographic map • A layer containing the slope grid for the study area was prepared as one of the layers 05/04/2008 BASHIR NWER GEOTUNIS 2012 11
- 12. UNIVERSITY of Tripoli 3- Methodology ( 7-9) Climate Climate classification classification Soil Soil classification classification Suitability Suitability Overlay Overlay Assessment Assessment Erosion Erosion classification classification Hazard Hazard Topography Topography classification classification (Slope) (Slope) 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 12
- 13. 3-Methodology ( 8-9) UNIVERSITY of Tripoli (Land Suitability analysis and Sensitivity Analysis) • Overall land suitability based upon equal weighting for the four layers was determined • Sensitivity analysis provides further confidence in a model, and indicates priority areas for refinement if further versions of a model are to be developed. Input Input model Output Output model Vary inputs and observe Effects 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 13
- 14. UNIVERSITY 3-Methodology ( 9-9) of Tripoli 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 14
- 15. UNIVERSITY 4-Findings of Tripoli A methodological framework for an area of the world never before assessed, reviewing range of alternative methodologies considering pros and cons of each in turn Compilation of validated and verified key data (fully specifying parts of the framework ) which addresses the model specifications identified Implementation of a practical information system which allows the combination of these data sets, together with the model framework, and which can produce thematic interpretations (maps relevant to policy) 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 15
- 16. UNIVERSITY 5-Conculsion of Tripoli Computer systems and GIS allow land evaluation to be performed more efficiently; they limit the margin for human error, and save time and cost. The limitations of conventional land evaluation methods and the huge administration burden they create has been simplified and made efficient in this approach. Developing a responsive model, where the changes in crop production methods could be easily reflected in the results, supporting further spatial analysis of the changes, is the only way forward for crop suitability assessment, especially in Libya. 05/04/2008 DR BASHIR NWER GEOTUNIS 2012 16
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